河北沿海海侵灾害初探

文中以包含海进、海岸侵蚀和海水入侵的广义“海侵”概念,论述河北沿海地区海侵现状及其危害,探讨海侵产生的自然原因和人为活动的影响,在此基础上,评估海侵发展趋势。     

皇城—双塔断裂带的几何分段及运动学特征

在室内航,卫片解释及野外１：５万大比例尺活断层地质填图等专项研究的基础上,论证了１９２７年古浪８级大震主发震断裂皇城－双塔断裂带的几何分段及运动学特征。依据断层的几何特征,活动时期,活动强度可将该断裂带分为３段,分别为皇城盆地段（西段）、上寺段（中段）和冬青顶段（东段）。其中东段是古浪地震的发震段,与西段和中段相比,它具有活动时代新、活动强度大等特点,属全新世活动段。１９２７年古浪地震的发生与其特     

1927年古浪8级大震地表破裂特征及形成机制

野外考察结果表明,１９２７年古浪８级大地震造成了６段不同规模、不同方向、不同力学成因、不同等级的地表破裂,构成了呈面状分布的复杂地震破裂带,与我国西部地区由走滑断层运动形成的破裂带相比具有较大差异。其中的４段破裂与极震区及余震分布的位置相重合,主体散布在冬青顶北麓一带,沿皇城－双塔活动断裂的东段和武威－天祝活动断裂北段分布,是１９２７年古浪地震的主破裂带。其余两段分别分布在Ⅸ度区内的皇城－双塔断裂中段和西山堡－滴水崖断裂带上,是高烈度区内的次级破裂。４段主破裂是在统一构造应力场作用下形成的产物,具有统一变形机制。其中冬青顶张性破裂带是发育在山前下方寨－严家新庄逆断层上盘的次级张性破裂,而主破裂是由逆断层运动在寺儿沟滩等处的山前洪积台地上产生的     

三维地震数据的方位角时差校正及其应用

三维地震数据的同一共中心点道集是由不同方位角的地震道组成的。当地下地层倾斜时,共中心点道集的反射同相轴就存在方位角时差。本文根据方位角时差校正（ＡＭＯ）的基本原理,从ｆ－ｋ域的正、逆ＤＭＯ出发,通过稳相法得到积分法ＡＭＯ脉冲响应的时间、振幅因子公式。把ＡＭＯ应用于一束实际三维地震数据处理,经ＡＭＯ处理后的剖面绕射波和断面反射波得到了加强,其效果是令人满意的。     

Platinum-Group Element Geochemical Certified Reference Materials (GPt1-7)

Unlike the situation for other elements, few reference materials certified for the platinum-group elements are currently available. Therefore, the GPt1-7 series of PGE geochemical CRMs, prepared by the IGGE, represent an important addition and comprise a range of matrix types, including a soil, stream sediment, Mg-rich ultramafic rock, Fe-rich ultramafic rock, platinoid ore depleted in Cu, Ni and Fe, and a chromitite. The concentration of PGE in these samples ranges over 4-5 orders of magnitude and the samples were shown to have good homogeneity as assessed by a variance test. Analytical methods based on different principles were used in sample certification, including several fire assay and wet chemical procedures used for decomposition and preconcentration. Certified values for the elements Pt, Pd, Os, Ru, Ir, Rh and Au were determined by AAS, catalytic colourimetry (COL), catalytic polarography (POL), atomic emission spectrometry (AES), ICP-MS and NAA. Recently, the GPt1-7 samples were approved as national primary CRMs by the State Bureau of Technical Supervision of China.     

金属成矿各论(二)

本文从分散元素讨论金属成矿问题,这必然涉及到与它们共存金属的成矿体系。因而提出金属元素的产生和资源类型之间的关系问题,供今后研究。一、一般情况分散元素是一个经验名词,是指常存在于另一种主金属矿物中的元素,它们虽在一定条件下也可以形成独立矿物,但是它们很少形成自己的独立矿石。因此,找分散元素的富集点常是在金属矿石里下工夫。     

Electro-connection marine corrosion test method and its application

Corrosion of marine steel constructions may vary to a considerable extent owing to their different locations such as atmosphere, splash zone, tidal zone, immersion zone and mud zone^{[7, 8]}. A rather lengthy hanging steel sample is needed to test its corrosion resistance in various environments. But it is cumbersome to handle and not convenient for frequent observation and maintenance. So an indoor analogue test method is generally adopted for this purpose^[1]. This paper is a report of such a test. Contribution No. 1333 from the Institute of Oceanology, Academia Sinica.